these parameters, authors can structure the presentation (e.g., format, language, and level of detail presented) to the appropriate audience. The following comments on document format and presentation provide specific recommendations toward that end.

Length of TSDs: Some TSDs are excessively long, not because there is so much relevant data, but because the presentation has not been limited to information focused on deriving AEGL values.

TSD format: Consider a revised format for TSDs that would make the document easier for the intended audience to read and understand. A modified outline format, using subparagraphs with indentation, bullets, or other ways to set off specific elements may be helpful. A single paragraph that consumes half a page or more is almost certainly too long—and far too common in the TSDs.

TSD summary: Authors of TSDs should not only cut-and-paste from various sections of the document to form a summary. The summary should be phrased differently from the text of the document as the readership of summaries is broader than that for the TSD itself, and the summary is likely to be read under different circumstances.

Redundancy across sections: TSDs often have a paragraph or two (usually very long) on the derivation of each AEGL values, and there is an appendix providing an AEGL derivation summary (with a structured form that typically covers a whole page). Could these sections be combined? Separately, there is an appendix showing the calculation of n, and there is an appendix on the calculation of each AEGL for each time point. Could these be combined? Other examples of redundant materials or presentations exist. If some repetition is desirable, consider whether cross-referencing would be acceptable (e.g., “see calculation in Appendix Q” or “see discussion on page Z”).

Category plots: State in the SOP that category plots will be generated by TSD developers to summarize data used to develop AEGL values. Also, indicate that an illustration should be provided by TSD developers to compare observed effects with the AEGL-1, AEGL-2, and AEGL-3 effects.

Comments on Use of References

Use of secondary sources, papers cited by others: If a reference of a common secondary source is cited, check for a more recent version that contains the material to be referenced, verify the information being referenced, and cite the most recent version. Sometimes material in an earlier edition is dropped a later edition or is updated. This is especially appropriate for annually updated sources, such as the TLVs, WEELs, or ERPGs, which can change and certain values or the references used to support them can be withdrawn.

If the primary article is not accessible, the citation should indicate something like “article x, as summarized in article y.” This is not necessary when citing a secondary source, such as a widely used standard reference or handbook.

Reference citing: If a document or a database is available online (other than a journal article), the URL should be provided to improve ease of access for the end user with either an index page for a collection of documents or the specific page for the referenced document, along with the date accessed.

Comment References

NRC (National Research Council). 1993. Guidelines for Developing Community Emergency Exposure Levels for Hazardous Substances. Washington, DC: National Academy Press.

NRC (National Research Council). 2001. Standing Operating Procedures for Developing Acute Exposure Guideline Levels for Hazardous Chemicals. Washington, DC: National Academy Press.

Perez, C., and S.C. Soderholm. 1991. Some Chemicals Requiring Special Consideration When Deciding Whether to Sample the Particle, Vapor, or Both Phases of an Atmosphere. Appl. Occup. Environ. Hyg. 6(10):859-864.

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